Vermes
Advanced Member level 4
This is a construction of strong panel for subwoofer, which can deal with bsw 104II. This panel was made on Holton 600.
Power supply consists of two electric transformers. Each of those transformers has a power of 500VA and idle voltage of 60V, which gives after rectifying approximately 84V+/-. Transformers were bridged and operate as one.
Another power supply was made of a battery of capacitors Rubycon 3300uF, 100V each, which gives 33000uF in total. Then there is a Holton on 6 pairs of transistors – the amplifier can gain more than 550W at 4ohm.
There are also safety fuses, softstart system and automatic switch on the panel.
Preamplifier is equipped with adjsutable cut-off 15-60Hz, the phase change etc and equalizer, which operates at 20-80Hz. Both of Is audio design.
Link to original thread - Panel subwoofera 550W/4ohm